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Regulatory Requirements and Subsidiary Dividend Restrictions - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details)	Sep. 30, 2025 USD ($)
Capital and Other Regulatory Requirements [Abstract]
Adjusted net capital	$ 10,000,000
StoneX Financial Inc.
Capital and Other Regulatory Requirements [Abstract]
Adjusted net capital	1,500,000
Capital and Other Regulatory Requirements [Line Items]
Actual	519,100,000
Minimum Requirement	362,800,000
StoneX Financial Ltd
Capital and Other Regulatory Requirements [Line Items]
Actual	557,400,000
Minimum Requirement	457,100,000
GAIN Capital Group, LLC
Capital and Other Regulatory Requirements [Line Items]
Actual	65,800,000
Minimum Requirement	30,400,000
StoneX Financial Pte. Ltd.
Capital and Other Regulatory Requirements [Line Items]
Actual	127,400,000
Minimum Requirement	26,300,000
StoneX Markets LLC
Capital and Other Regulatory Requirements [Line Items]
Actual	252,500,000
Minimum Requirement	154,400,000
R.J. O’Brien & Associates LLC
Capital and Other Regulatory Requirements [Line Items]
Actual	367,400,000
Minimum Requirement	275,800,000
R.J. O’Brien Limited
Capital and Other Regulatory Requirements [Line Items]
Actual	39,100,000
Minimum Requirement	$ 20,300,000

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Capital and Other Regulatory Requirements [Abstract]

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Capital and Other Regulatory Requirements [Line Items]

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Minimum amount of net capital required to be maintained by broker-dealer subsidiary to engage in security transaction, calculated under Aggregate Indebtedness Standard.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Rule 15c3-1
-Number 240
-Section 15c3-1
-Publisher SEC

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Amount of adjusted net capital of futures commission merchant (FCM) per Commodity Futures Trading Commission's (CFTC) requirement.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name CFTC Regulation
-Number 1
-Section 17
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Amount of net capital required to be maintained by futures commission merchant (FCM) per Commodity Futures Trading Commission's (CFTC) requirement.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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